Biotische Aktivitäten und Auswaschung organischer Komponenten in der Nadelförna

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Abstract
At monthly intervals 4 types of decomposing needle litter (Douglas fir, European larch, Norway spruce, Scotch pine) were investigated comparing their biotic activity as demonstrated by enzyme and respiration measurements. Based on the annual mean values of individual activities, measurements indicated differences between litter species due to the effects of species. Consistently low moisture levels were found to produce marked decreases in respiration rates. Special emphasis was placed on determining the leaching rates in the litter layer of phenolic compounds and of soluble carbohydrates (sugars). As to an ecological evaluation of the results, it is suggested that the variability of enzyme activity, respiration rates, water retention and leaching may be attributed to changing properties of the litter influenced by microbial decomposer organisms and climatic conditions.